In running my KPA500/KAT500 combo I found no issues with any RFI of any
type.
Now what I did find, if I hit it too hard, it would flat top and
generate all sorts of crap. This sould get into the computer and lock
up WSJT-x. Also It would turn on or turn off one of the TVs on
satellite service. And the satellite receiver would change channels.
(That really annoyed the XYL)
I find the amp to be very clean up to a point. Exceed that point, even
the slightest amount, and it turns into a quasi square wave generator.
No amount of filtering I tried would remedy the issue. The only solution
is to set the drive power to attain 500 watts or less as measured on a
reliable power meter. Then don't let the exciter exceed that drive
level. I then set the PWR CAL via the amp menu for the correct value.
This must be done on each band using a known good dummy load.
I used my K3S to drive the amp and had the PWR SET PER BND active. The
amp does require slightly different drive power amounts on different
bands. I also set my TUNE PWR in the radio for 20 watts. This would
always drive the amp to near rated output.
The station antennas, the coax center fed 80/40M has a 1:1 balun at the
feed-point, the 160M 1/2 wave wire is center fed with balanced line and
a custom hybrid balun at the operating desk. Each piece of station
equipment is bonded by a dedicated conductor to the station power supply
ground terminal. Being on the 2nd floor of the house, I do not use
any external station ground. Lightning protection is accomplished
outside of the house.
Hope this helps.
73
Bob, K4TAX
On 11/23/2022 9:58 AM, elecraft-requ...@mailman.qth.net wrote:
Message: 13
Date: Tue, 22 Nov 2022 22:36:46 +0000 (UTC)
From: Al Lorona<alor...@sbcglobal.net>
To: Elecraft Reflector<elecraft@mailman.qth.net>
Subject: [Elecraft] Running high power
Message-ID:<1647168817.1936686.1669156606...@mail.yahoo.com>
Content-Type: text/plain; charset=UTF-8
I'm really curious to ask those on this list who run high power:
Do you find that you get into all kinds of devices around the house?
I ran the KPA-500 in an extended manner for really the first time during the
Phone SS and immediately:
1/ interfered with FM broadcast radio.
2/ caused the internet to drop out every time I keyed up on the lower bands.
Am I the only one? Those of you who run high power all the time... how do you
deal with these annoyances?
Al? W6LX/4
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